Index
- Macbridea alba, white birds-in-a-nest
- Macfadyena unguis-cati, catclawvine
- Macranthera flammea, flameflower, hummingbird flower
- Macroptilium lathyroides, phasey bean
- Macrothelypteris torresiana, Mariana maiden fern
- Magnolia acuminata, cucumber magnolia
- Magnolia grandiflora, southern magnolia
- Magnolia macrophylla var. ashei, Ashe's magnolia
- Magnolia pyramidata, pyramid magnolia
- Magnolia virginiana, sweet-bay
- Malaxis spicata, Florida adder's-mouth
- Malaxis unifolia, green adder's-mouth
- Malus angustifolia, southern crabapple
- Malvaviscus penduliflorus, Turkscap mallow, mazapan
- Manilkara bahamensis, wild dilly, wild sapodilla
- Manilkara jaimiqui subsp. emarginata, wild dilly
- Manilkara zapota, sapodilla
- Marshallia graminifolia, slim-leaf Barbara's buttons
- Marsilea vestita, hairy water-clover
- Matelea alabamensis, Alabama spiny-pod
- Matelea floridana, Florida spiny-pod
- Matelea gonocarpos, climbing anglepod
- Matelea pubiflora, sandhill spiny-pod
- Mayaca fluviatilis, bog-moss
- Maytenus phyllanthoides, Florida mayten
- Mecardonia acuminata, axilflower, purple mecardonia
- Mecardonia acuminata subsp. peninsulari, axilflower, purple mecardonia
- Mecardonia procumbens, baby jumpup
- Medeola virginiana, Indian cucumber-root
- Medicago lupulina, black medic
- Melaleuca quinquenervia, punk tree, melaleuca
- Melanthera nivea, snow squarestem
- Melanthera parvifolia, small-leaved melanthera
- Melia azedarach, chinaberry
- Melica mutica, twoflower melic
- Melilotus albus, white sweetclover
- Melilotus indicus, sour clover, Indian clover
- Melilotus officinalis, yellow sweetclover
- Melochia spicata, hairy melochia, bretonica peluda
- Melothria pendula, creeping cucumber
- Menispermum canadense, moonseed
- Mentha spicata, spearmint
- Mentzelia floridana, poorman's patch, stickleaf
- Merremia dissecta, noyau vine, cut-leaf morning glory, alamo vine
- Metopium toxiferum, poisonwood
- Micranthemum umbrosum, shade mudflower
- Micromeria brownei var. pilosiuscula, false pennyroyal
- Mikania cordifolia, Florida Keys hempweed
- Mikania scandens, climbing hempweed
- Mimosa quadrivalvis, sensitive briar
- Mimosa strigillosa, herbaceous mimosa
- Mimulus alatus, monkeyflower
- Mirabilis jalapa, four-o'clock
- Mitchella repens, partridge berry
- Mitreola petiolata, stalked miterwort
- Mitreola sessilifolia, miterwort
- Momordica charantia, wild balsam-apple
- Monanthochloe littoralis, shoregrass, keygrass
- Monarda punctata, dotted horsemint
- Monotropa hypopithys, pinesap, false-beechdrops
- Monotropa uniflora, Indian pipe
- Morinda royoc, cheese plant, Indian mulberry
- Morrenia odorata, strangler-vine
- Morus alba, white mulberry
- Morus rubra, red mulberry
- Muhlenbergia capillaris, hairgrass
- Murdannia keisak, marsh dewflower, wart-removing herb
- Murdannia nudiflora, dove weed, naked-stem dewflower
- Musa xparadisiaca, bananna
- Muscari neglectum, grape-hyacynth, bluebottle
- Myosotis macrosperma, large-seeded forget-me-not
- Myrcianthes fragrans, Simpson's ironwood, twinberry
- Myrica cerifera, wax myrtle
- Myrica heterophyla, swamp candleberry, evergreen bayberry
- Myrica inodora, odorless wax myrtle
- Myriophyllum aquaticum, parrot's-feather
- Myriophyllum spicatum, Eurasion water-milfoil